(FILES) A file photo taken on December 01, 1973 in London shows former Zairean president Mobutu Sese Seko with Britain's Queen Elizabeth II. - From a string of US presidents to Lady Gaga, Queen Elizabeth II met leading political and artistic personalities from around the globe during her record-breaking time on the throne. Some were despised dictators, others world-famous guitarists she made polite conversation with. Regardless of the personalities, she always kept her composure. (Photo by AFP)